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| Date | Sunday 27 September 1981 |
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| Start time | 14:00 |
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| Event | Canadian GP |
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| Circuit | Montréal |
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| Event Format | Race of 70 laps |
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| Race | 15 of 16 |
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| Championship race | 356 |
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| Laps | 63 |
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| Circuit Perimeter | 4410 m |
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| Race Distance | 4410 × 70 = 308.700 km (scheduled)
4410 × 63 = 277.830 km (raced) |
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| Grid Format | 2-2-2-2 (staggered) |
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| Pole Position | Right |
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| First Corner | Left |
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| Track Direction | Clockwise |
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| Weather | Overcast, Rain |
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| Entries | 30 |
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| Qualifiers | 24 |
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| Finishers | 12 |
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| Championship Debutants | Jacques Villeneuve (Snr) (Driver) |
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| Milestones | Brian Henton - 20th Race Entry (Driver)
Elf - 50th Pole Position (Lubricant Manufacturer)
March Grand Prix Team - 20th Race Entry (Entrant)
Marlboro McLaren International - 1st Fastest Lap (Entrant)
Unipart - 1st Fastest Lap (Lubricant Manufacturer)
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| Records Broken |
1. Most 3rd Fastest Laps – Carlos Reutemann (9),
2. Most 20th Fastest Laps – Lotus (10),
3. Most 20th Place Qualifications – March (26)
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| Records Extended |
1. Most Constructors' Championship Points Scores – Ferrari (287),
2. Most Retirements – Lotus (397),
3. Most Drivers' Championship Points Scores – Ferrari (419),
4. Most Podium Finishes – Ferrari (272),
5. Most 3rd Place Finishes – Ferrari (84),
6. Most 9th Fastest Laps – Lotus (22),
7. Most Race Entries – Lotus (918),
8. Most 23rd Place Qualifications – Jean-Pierre Jarier (7)
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